Allowable values of predecessorsIdentifierScheme element

Code	Label	Definition
eionetGroundWaterBodyCode	EIONET groundwater body identifier scheme	Identifier scheme for groundwater bodies or equivalent spatial units, reported by EIONET countries that do not report under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation. Also includes other groundwaters or aquifers that are not WFD water bodies, but are used for reporting purposes under WISE SoE.
eionetProtectedAreaCode	EIONET protected area identifier scheme	Identifier scheme for protected area in countries not reporting under the Water Framework Directive (for example, when reporting Bathing Waters in Switzerland or Albania).
eionetRBDCode	EIONET river basin district identifier scheme	Identifier scheme for river basin districts or equivalent spatial unit, reported by EIONET countries that do not report under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.
eionetSubUnitCode	EIONET river basin district sub-unit identifier scheme	Identifier scheme for river basin district sub-units or equivalent spatial unit, reported by EIONET countries that do not report under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.
eionetSurfaceWaterBodyCode	EIONET surface water body identifier scheme	Identifier scheme for surface water bodies or equivalent spatial units, reported by EIONET countries that do not report under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation. Also includes small lakes and other surface waters that are not WFD water bodies, but are used for reporting purposes under WISE SoE.
euGroundWaterBodyCode	WFD groundwater body identifier scheme	Identifier scheme for groundwater bodies reported under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.
euProtectedAreaCode	WFD protected area identifier scheme	Identifier scheme for protected areas under the Water Framework Directive (WFD) Article 6 and Annex IV.
euRBDCode	WFD river basin district identifier scheme	Identifier scheme for river basin districts reported under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.
euSubUnitCode	WFD river basin district sub-unit identifier scheme	Identifier scheme for river basin district sub-units reported under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.
euSurfaceWaterBodyCode	WFD surface water body identifier scheme	Identifier scheme for surface water bodies reported under the "Water Framework Directive - River Basin Management Plans - 2016 Spatial data" reporting obligation.